Combined satellite gravity field model <i>GOCO01S</i> derived from GOCE and GRACE

Pail, Roland; Goiginger, Helmut; Schuh, Wolf-Dieter; Höck, Eduard; Brockmann, Jan Martin; Fecher, T.; Gruber, Thomas; Mayer‐Gürr, Torsten; Kusche, Jürgen; Jäggi, Adrian; Rieser, Daniel

doi:10.1029/2010gl044906

Cited by 211 publications

(142 citation statements)

References 15 publications

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“…This is a development of GOCO02S and previous models by the Gravity Observation COmbination (GOCO, www.goco.eu, Pail et al 2010). The 'Extended' refers to the use of GOCO03S to degree 180, to which information from the Earth Gravitational Model 2008 (EGM08) (Pavlis et al 2012) has been added so as to provide a model to degree 2190.…”

Section: Mdt Values At Mediterranean Tide Gaugesmentioning

confidence: 99%

The status of measurement of the Mediterranean mean dynamic topography by geodetic techniques

Woodworth

Gravelle

Marcos

et al. 2015

J Geod

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We review the measurement of the mean dynamic topography (MDT) of the Mediterranean using ellipsoidal heights of sea level at discrete tide gauge locations, and across the entire basin using satellite altimetry, subtracting estimates of the geoid obtained from recent models. This 'geodetic approach' to the determination of the MDT can be compared to the independent 'ocean approach' that involves the use of in situ oceanographic measurements and ocean modelling. We demonstrate that with modern geoid and ocean models there is an encouraging level of consistency between the two sets of MDTs. In addition, we show how important geodetic MDT information can be in judging between existing global ocean circulation models, and in providing insight for the development of new ones. The review makes clear the major limitations in Mediterranean data sets that prevent a more complete validation, including the need for improved geoid models of high spatial resolution and accuracy. Suggestions are made on how a greater amount of reliable geo-located tide gauge information can be obtained in the future. IntroductionThis paper discusses the mean dynamic topography (MDT) of the Mediterranean and its measurement by geodetic techniques. The MDT is the amount by which the Mean Sea Surface (MSS) is further from the centre of the Earth than a surface called the geoid, which is an equipotential surface resulting from the Earth's spatially-varying gravity field, and which would correspond to the MSS in the absence of an ocean circulation. An accurate measurement of the MDT can, therefore, provide oceanographers with insight into the circulation. Conversely, knowledge of the circulation, obtained by a number of oceanographic techniques can be used to infer the MDT. 2Much is already known about the mean circulation of the Mediterranean and its variability (e.g. Pinardi and Masetti 2000) and, therefore, also about the spatial variation of its MDT. This insight has largely been obtained using in situ oceanographic measurements and ocean modelling. However, in recent years major advances have been made in geodetic techniques that have enabled the MDT to be determined, for the first time, as the difference between MSS and geoid to the accuracy required for oceanographic research (e.g. Bingham et al. 2014). These techniques have primarily involved satellite altimetry to provide the MSS over the open ocean and space gravity to provide the geoid, complemented at the coast with the use of tide gauges equipped with Global Positioning System (GPS) equipment (Woodworth et al. 2012). By studying the Mediterranean, particular lessons can be learned in the use of these techniques, notably by pointing to missing infrastructure and data limitations, which can also be relevant to discussion of the MDT in other data-sparse regions around the world.Models of the MDT in the Mediterranean have already been made by previous authors in various ways (e.g. Rio et al. 2014a). Consequently, the present paper focuses on reviewing how an MDT model can be compa...

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Section: Mdt Values At Mediterranean Tide Gaugesmentioning

confidence: 99%

The status of measurement of the Mediterranean mean dynamic topography by geodetic techniques

Woodworth

Gravelle

Marcos

et al. 2015

J Geod

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“…Zielinski and Petrovskaya (2003) proposed a balloon-borne gradiometer to fly at 20-40 km altitude simultaneously with satellite mission and proposed downward continuation of satellite data and comparing them with balloon-borne data. Pail (2003) proposed a combined adjustment method supporting high quality gravity field information within the well-surveyed test area for the continuation of the local gravity field upward and validating the SGG data. Bouman et al (2004) stated that there were some limitations in generating the SGG data using terrestrial gravimetry data and the EGMs.…”

Section: C) Validation Of Goce Data By External Sources Of Datamentioning

confidence: 99%

“…a) Validation of GOCE products Today, the concentrations of the geodetic researchers are on the evaluation of the GOCE products determined by three different methods of time-wise (TIM), spacewise (SPW) and direct (DIR); see Pail et al (2011). Hirt et al (2011) compared some of GOCE EGMs with terrestrial gravimetric data over Switzerland, Austria and astrogeodetic deflections over Europe.…”

Section: Introductionmentioning

confidence: 99%

“…Janak and Pitonak (2011) evaluated the GOCE products in central Europe and Slovakia. They mentioned that TIM2 and SPW2 to degree 210 are much better than the previous releases to the same degree and GOCO02S (GOIGINGER et al 2011) has a significant improvement comparing to GOCO01S (PAIL et al 2010). Sprlak et al (2012) did the same study in Norway and mentioned that the direct solutions are highly affected by a priori information and time-wise solution is more reliable.…”

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confidence: 99%

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Deterministically-Modified Integral Estimators of Gravitational Tensor

Romeshkani

Eshagh

2015

Bol. Ciênc. Geod.

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The Earth's global gravity field modelling is an important subject in Physical Geodesy. For this purpose different satellite gravimetry missions have been designed and launched. Satellite gravity gradiometry (SGG) is a technique to measure the second-order derivatives of the gravity field. The gravity field and steady state ocean circulation explorer (GOCE) is the first satellite mission which uses this technique and is dedicated to recover Earth's gravity models (EGMs) up to medium wavelengths. The existing terrestrial gravimetric data and EGM scan be used for validation of the GOCE data prior to their use. In this research, the tensor of gravitation in the local north-oriented frame is generated using deterministicallymodified integral estimators involving terrestrial data and EGMs. The paper presents that the SGG data is assessable with an accuracy of 1-2 mE in Fennoscandia using a modified integral estimatorby the Molodensky method. A degree of modification of 100 and an integration cap size of 2.5 o for integrating 55   terrestrial data are proper parameters for the estimator.

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“…Geophys. Geod., 61 (2017) Second, to compute the "reference gravity anomalies", we reduce the high-resolution "topography-implied and measurement-adjusted gravity anomalies" for the contribution of the regularized version of GOCO05S (Pail et al, 2010;Mayer-Gürr et al, 2015) complete to degree 280. This allows the limitation of the integration domain  i of Fig.…”

Section: 3 P R a C T I C A L A S P E C T Smentioning

confidence: 99%